2 Jack 12's 3012HO loaded, with 8x melded array

[cboogie1]

Nevermind I found it by looking in the appropriate forum

[Zack Brock]

[...] It's true, they get louder at a distance! [...]
The moral of the story is that I will try to put some distance between myself and the cab in the future, to get a better idea of the true sound and volume. I will also seriously consider building a J10 pair, I think that would be better suited to the venue.

Volume of all sound sources drops with distance, even Bill's cabinets. What you are most likely experiencing in the scenario you described is that on the stage you were in one or more null zones: http://billfitzmaurice.info/forum/viewtopic.php?t=999